Explore topic-wise MCQs in Electrical Engineering.

This section includes 12 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering knowledge and support exam preparation. Choose a topic below to get started.

1.

If a 4ohm, 3ohm and 2ohm resistor is connected in delta, find the equivalent star connection.

A. 8/9ohm, 4/3ohm, 2/3ohm
B. 8/9ohm, 4/3ohm, 7/3ohm
C. 7/9ohm, 4/3ohm, 2/3ohm
D. 8/9ohm, 5/3ohm, 2/3ohm
Answer» B. 8/9ohm, 4/3ohm, 7/3ohm
Discussion
2.

If a 6 ohm, 2ohm and 4ohm resistor is connected in delta, find the equivalent star connection.

A. 1ohm, 2ohm, 3ohm
B. 2ohm, 4ohm, 7ohm
C. 5ohm, 4ohm, 2ohm
D. 1ohm, 2ohm, 2/3ohm
Answer» E.
Discussion
3.

Rab is the resistance between the terminals A and B, Rbc between B and C and Rca between C and A. These 3 resistors are connected in delta connection. After transforming to star, the resistance at C will be?a) Rac/(Rab+Rbc+Rca)b) Rab/(Rab+Rbc+Rca)c) Rbc*Rac/(Rab+Rbc+Rca)d) Rab/(Rab+Rbc+Rc

A. Rac/(Rab+Rbc+Rca)
B. Rab/(Rab+Rbc+Rca)
C. Rbc*Rac/(Rab+Rbc+Rca)
D. Rab/(Rab+Rbc+Rca)
Answer» D. Rab/(Rab+Rbc+Rca)
Discussion
4.

Rab is the resistance between the terminals A and B, Rbc between B and C and Rca between C and A. These 3 resistors are connected in delta connection. After transforming to star, the resistance at B will be?a) Rac/(Rab+Rbc+Rca)b) Rab/(Rab+Rbc+Rca)c) Rbc*Rab/(Rab+Rbc+Rca)d) Rab/(Rab+Rbc+Rc

A. Rac/(Rab+Rbc+Rca)
B. Rab/(Rab+Rbc+Rca)
C. Rbc*Rab/(Rab+Rbc+Rca)
D. Rab/(Rab+Rbc+Rca)
Answer» D. Rab/(Rab+Rbc+Rca)
Discussion
5.

Rab is the resistance between the terminals A and B, Rbc between B and C and Rca between C and A. These 3 resistors are connected in delta connection. After transforming to star, the resistance at A will be?a) Rab*Rac/(Rab+Rbc+Rca)b) Rab/(Rab+Rbc+Rca)c) Rbc*Rac/(Rab+Rbc+Rca)d) Rac/(Rab+Rbc+Rc

A. Rab*Rac/(Rab+Rbc+Rca)
B. Rab/(Rab+Rbc+Rca)
C. Rbc*Rac/(Rab+Rbc+Rca)
D. Rac/(Rab+Rbc+Rca)
Answer» B. Rab/(Rab+Rbc+Rca)
Discussion
6.

Find the equivalent star network.

A. 2.3ohm, 2.3ohm, 2.3ohm
B. 1.2ohm, 1.2ohm, 1.2ohm
C. 3.3ohm, 3.3ohm, 3.3ohm
D. 4.5ohm, 4.5ohm, 4.5ohm
Answer» C. 3.3ohm, 3.3ohm, 3.3ohm
Discussion
7.

The value of the 3 resistances when connected in star connection is_________

A. 2.32ohm,1.22ohm, 4.54ohm
B. 3.55ohm, 4.33ohm, 5.67ohm
C. 2.78ohm, 1.67ohm, 0.83ohm
D. 4.53ohm, 6.66ohm, 1.23ohm
Answer» D. 4.53ohm, 6.66ohm, 1.23ohm
Discussion
8.

IF_A_4OHM,_3OHM_AND_2OHM_RESISTOR_IS_CONNECTED_IN_DELTA,_FIND_THE_EQUIVALENT_STAR_CONNECTION.?$

A. 8/9ohm, 4/3ohm, 2/3ohm
B. 8/9ohm, 4/3ohm, 7/3ohm
C. 7/9ohm, 4/3ohm, 2/3ohm
D. 8/9ohm, 5/3ohm, 2/3ohm
Answer» B. 8/9ohm, 4/3ohm, 7/3ohm
Discussion
9.

If a 6 ohm, 2ohm and 4ohm resistor is connected in delta, find the equivalent star connection?

A. 1ohm, 2ohm, 3ohm
B. 2ohm, 4ohm, 7ohm
C. 5ohm, 4ohm, 2ohm
D. 1ohm, 2ohm, 32/3ohm
Answer» E.
Discussion
10.

Rab is the resistance between the terminals A and B, Rbc between B and C and Rca between C and A. These 3 resistors are connected in delta connection. After transforming to star, the resistance at A will be?

A. Rab*Rac/(Rab+Rbc+Rca)
B. Rab/(Rab+Rbc+Rca)
C. Rbc*Rac/(Rab+Rbc+Rca)
D. Rac/(Rab+Rbc+Rca)
Answer» B. Rab/(Rab+Rbc+Rca)
Discussion
11.

Star connection is also known as__________

A. Y-connection
B. Mesh connection
C. Either Y-connection or mesh connection
D. Neither Y-connection nor mesh connection
Answer» B. Mesh connection
Discussion
12.

Which, among the following is the right expression for converting from delta to star?

A. R1=Ra*Rb/(Ra+Rb+Rc), R2=Rb*Rc/(Ra+Rb+Rc), R3=Rc*Ra/(Ra+Rb+Rc)
B. R1=Ra/(Ra+Rb+Rc), R2=Rb/(Ra+Rb+Rc), Rc=/(Ra+Rb+Rc)
C. R1=Ra*Rb*Rc/(Ra+Rb+Rc), R2=Ra*Rb/(Ra+Rb+Rc), R3=Ra/(Ra+Rb+Rc)
D. R1=Ra*Rb*Rc/(Ra+Rb+Rc), R2=Ra*Rb*Rc/(Ra+Rb+Rc), R3=Ra*Rb*Rc/(Ra+Rb+Rc)
Answer» B. R1=Ra/(Ra+Rb+Rc), R2=Rb/(Ra+Rb+Rc), Rc=/(Ra+Rb+Rc)
Discussion